Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with their given values.

Front

Evaluate the expression: x=7, y=15, z=8; xz - 2y + 8

Back

34

Front

Evaluate the expression: a=3, b=4; 36 ÷ 6a

Back

18

Front

Evaluate the expression: x=7, y=15, z=8; 9y ÷ (2x+1)

Back

9

Front

Evaluate the expression: a=3, b=4; ab ÷ 3

Back

4

Front

Evaluate the expression: a=3, b=4; ab + 7 x 11

Back

89

Front

What is a variable in an expression?

Back

A variable is a symbol (often a letter) that represents an unknown value in an expression.

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Front

What is the result of multiplying a number by zero?

Back

The result of multiplying any number by zero is always zero.